v0.2.9

Pre-release for v0.2.9.

Changes:

• Browser tabs can participate in native split panes.
• Fixed focus recovery when switching back from browser tabs and URL input.
• Fixed search field icon/text overlap.
• Added workspace rename and pin support with persisted pinned state.
• Added Cmd+B workspace sidebar collapse with left-edge hover peek.
• Bumped desktop app and CLI versions to 0.2.9.